<%@ page language="java" 
contentType="text/html; charset=UTF-8"    
 %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
 <%
    String count="100";
    pageContext.setAttribute("cnt",count);
%>
Count:${pageScope.cnt+100}

</body>
</html>